<?php
define('DB_HOST', 'localhost');
define('DB_USER', 'root');
define('DB_PASS', '');
define('DB_NAME', 'review_app');
//新建连接
$conn=new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);
//检查链接
if($conn->connect_error){
    die("连接失败".$conn->connect_error);
}
echo "连接成功";
?>